Cisco Systems IP Phone OL 11953 01 User Manual

C H A P T E R 2  
Preparing to Install the Cisco Unified  
IP Phone on Your Network  
Cisco Unified IP Phones enable you to communicate using voice over a data  
network. To provide this capability, the IP Phones depend upon and interact with  
several other key Cisco Unified IP Telephony components, including  
Cisco Unified Communications Manager.  
This chapter focuses on the interactions between the Cisco Unified IP Phone  
7961G/7961G-GE and 7941G/7941G-GE and Cisco Unified Communications  
Manager, DNS and DHCP servers, TFTP servers, and switches. It also describes  
options for powering phones.  
For related information about voice and IP communications, refer to this URL:  
This chapter provides an overview of the interaction between the  
Cisco Unified IP Phone and other key components of the Voice over IP (VoIP)  
network. It includes the following topics:  
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network  
Understanding Interactions with Other Cisco Unified IP Telephony Products  
For information about configuring Cisco Unified Communications Manager to  
work with the IP devices described in this chapter, refer to Cisco  
Unified Communications Manager Administration Guide, Cisco Unified  
Communications Manager System Guide, and to Cisco Unified Communications  
Manager Security Guide.  
For an overview of security functionality for the Cisco Unified IP Phone, see the  
“Understanding Security Features for Cisco Unified IP Phones” section on  
page 1-13.  
Note  
If the Cisco Unified IP Phone model that you want to configure does not appear  
in the Phone Type drop-down list in Cisco Unified Communications Manager  
Administration, go to the following URL and install the latest support patch for  
your version of Cisco Unified Communications Manager:  
Related Topic  
Telephony Features Available for the Cisco Unified IP Phone, page 5-2  
Understanding How the Cisco Unified IP Phone Interacts with the  
VLAN  
The Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE have an  
internal Ethernet switch, enabling forwarding of packets to the phone, and to the  
access port and the network port on the back of the phone.  
If a computer is connected to the access port, the computer and the phone share  
the same physical link to the switch and share the same port on the switch. This  
shared physical link has the following implications for the VLAN configuration  
on the network:  
The current VLANs might be configured on an IP subnet basis. However,  
additional IP addresses might not be available to assign the phone to the same  
subnet as other devices connected to the same port.  
Data traffic present on the VLAN supporting phones might reduce the quality  
of Voice-over-IP traffic.  
Network security may indicate a need to isolate the VLAN voice traffic from  
the VLAN data traffic.  
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You can resolve these issues by isolating the voice traffic onto a separate VLAN.  
The switch port that the phone is connected to would be configured to have  
separate VLANs for carrying:  
Voice traffic to and from the IP phone (auxiliary VLAN on the Cisco Catalyst  
6000 series, for example)  
Data traffic to and from the PC connected to the switch through the access  
port of the IP phone (native VLAN)  
Isolating the phones on a separate, auxiliary VLAN increases the quality of the  
voice traffic and allows a large number of phones to be added to an existing  
network where there are not enough IP addresses for each phone.  
For more information, refer to the documentation included with a Cisco switch.  
You can also access related documentation at this URL:  
Related Topics  
Network Configuration Menu, page 4-7  
Providing Power to the Cisco Unified IP Phone  
The Cisco Unified IP Phone 7961G, 7961G-GE and 7941G, 7941G-GE can be  
powered with external power or with Power over Ethernet (PoE). External power  
is provided through a separate power supply. PoE is provided by a switch through  
the Ethernet cable attached to a phone.  
Note  
When you install a phone that is powered with external power, connect the power  
supply to the phone and to a power outlet before you connect the Ethernet cable  
to the phone. When you remove a phone that is powered with external power,  
disconnect the Ethernet cable from the phone before you disconnect the power  
supply.  
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Providing Power to the Cisco Unified IP Phone  
The following sections provide more information about powering a phone:  
Power Guidelines  
Table 2-1 provides guidelines for powering the Cisco Unified IP Phone 7961G  
and 7941G.  
Table 2-2 provides guidelines for powering the Cisco Unified IP Phone  
7961G-GE and 7941G-GE.  
Table 2-1  
Powering Guidelines—Cisco Unified IP Phone 7961G and 7941G  
Power Type  
Guidelines  
External power—  
The Cisco Unified IP Phone 7961G and 7941G use the  
CP-PWR-CUBE-3 power supply.  
Provided through the  
CP-PWR-CUBE-3  
external power supply.  
External power—  
Provided through the  
The Cisco Unified IP Phone Power Injector may be used with any Cisco  
Unified IP Phone. Functioning as a midspan device, the injector delivers  
Cisco Unified IP Phone inline power to the attached phone. The Cisco Unified IP Phone Power  
Power Injector.  
Injector is connected between a switch port and the IP Phone, and supports  
a maximum cable length of 100m between the unpowered switch and the IP  
Phone.  
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Table 2-1  
Powering Guidelines—Cisco Unified IP Phone 7961G and 7941G (continued)  
Power Type  
Guidelines  
PoE power—Provided by  
a switch through the  
Ethernet cable attached  
to the phone.  
The Cisco Unified IP Phone 7961G and 7941G support Cisco inline  
PoE.  
The Cisco Unified IP Phone 7961G and 7941G support IEEE 802.3af  
power on signal pairs and spare pairs.  
To ensure uninterruptible operation of the phone, make sure that the  
switch has a backup power supply.  
Make sure that the CatOS or IOS version running on your switch  
supports your intended phone deployment. Refer to the documentation  
for your switch for operating system version information.  
External power—  
The inline power patch panel WS-PWR-PANEL is compatible with the  
Provided through inline Cisco Unified IP Phones 7961G and 7941G.  
power patch panel  
WS-PWR-PANEL  
Table 2-2  
Powering Guidelines—Cisco Unified IP Phone 7961G-GE and 7941G-GE  
Power Type  
Guidelines  
External power—  
The Cisco Unified IP Phone 7961G-GE and 7941G-GE use the  
CP-PWR-CUBE-3 external power supply only.  
Provided through the  
CP-PWR-CUBE-3  
external power supply.  
External power—  
Provided through the  
The Cisco Unified IP Phone Power Injector may be used with any Cisco  
Unified IP Phone. Functioning as a midspan device, the injector delivers  
Cisco Unified IP Phone inline power to the attached phone. The Cisco Unified IP Phone Power  
Power Injector.  
Injector is connected between a switch port and the IP Phone, and supports  
a maximum cable length of 100m between the unpowered switch and the IP  
Phone.  
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Table 2-2  
Powering Guidelines—Cisco Unified IP Phone 7961G-GE and 7941G-GE (continued)  
Power Type  
Guidelines  
PoE power—Provided by  
a switch through the  
Ethernet cable attached  
to the phone.  
The gigabit Ethernet Cisco Unified IP Phone 79161G-GE and  
7941G-GE do not support Cisco inline PoE.  
The Cisco Unified IP Phone 7961G-GE and 7941G-GE support IEEE  
802.3af power on signal pairs and spare pairs. The Cisco Unified IP  
Phone 79161G-GE and 7941G-GE are not compatible with Cisco  
switches that are not IEEE-compliant.  
To ensure uninterruptible operation of the phone, make sure that the  
switch has a backup power supply.  
Make sure that the CatOS or IOS version running on your switch  
supports your intended phone deployment. Refer to the documentation  
for your switch for operating system version information.  
External power—  
The inline power patch panel WS-PWR-PANEL is compatible with the  
Provided through inline Cisco Unified IP Phones 7961G-GE and 7941G-GE.  
power patch panel  
WS-PWR-PANEL  
Power Outage  
Your accessibility to emergency service through the phone is dependent on the  
phone being powered. If there is an interruption in the power supply, Service and  
Emergency Calling Service dialing will not function until power is restored. In the  
case of a power failure or disruption, you may need to reset or reconfigure  
equipment before using the Service or Emergency Calling Service dialing.  
Obtaining Additional Information about Power  
For related information about power, refer to the documents shown in Table 2-3.  
These documents provide information about the following topics:  
Cisco switches that work with the Cisco Unified IP Phone 7961G/7961G-GE  
and 7941G/7941G-GE  
The Cisco IOS releases that support bidirectional power negotiation  
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Other requirements and restrictions regarding power  
Table 2-3  
Related Documentation for Power  
Document Topics  
URL  
Power Injector  
PoE Solutions  
s379/prod_installation_guides_list.html  
Integrated Service  
Routers  
Cisco IOS Software  
Understanding Phone Configuration Files  
Configuration files for a phone are stored on the TFTP server and define  
parameters for connecting to Cisco Unified Communications Manager. In  
general, any time you make a change in Cisco Unified Communications Manager  
that requires the phone to be reset, a change is made to the phone’s configuration  
file automatically.  
Configuration files also contain information about which image load the phone  
should be running. If this image load differs from the one currently loaded on a  
phone, the phone contacts the TFTP server to request the required load files.  
(These files are digitally signed to ensure the authenticity of the files’ source.)  
In addition, if the device security mode in the configuration file is set to  
Authenticated and the CTL file on the phone has a valid certificate for  
Cisco Unified Communications Manager, the phone establishes a TLS connection  
to Cisco Unified Communications Manager. Otherwise, the phone establishes a  
TCP connection. For SIP phones, a TLS connection requires that the transport  
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protocol in the phone configuration file be set to TLS, which corresponds to the  
transport type in the SIP Security Profile in Cisco Unified Communications  
Manager.  
Note  
If the device security mode in the configuration file is set to Authenticated or  
Encrypted, but the phone has not received a CTL file, the phone will continuously  
try to obtain a CTL file so that it can register securely.  
If you configure security-related settings in Cisco Unified Communications  
Manager Administration, the phone configuration file will contain sensitive  
information. To ensure the privacy of a configuration file, you must configure it  
for encryption. For detailed information, refer to the “Configuring Encrypted  
Phone Configuration Files” chapter in Cisco Unified Communications Manager  
Security Guide.A phone requests a configuration file whenever it resets and  
registers with Cisco Unified Communications Manager.  
A phone accesses a default configuration file named XmlDefault.cnf.xml from the  
TFTP server when the following conditions exist:  
You have enabled auto-registration in Cisco Unified Communications  
Manager  
The phone has not been added to the Cisco Unified Communications  
Manager Database  
The phone is registering for the first time  
If auto registration is not enabled and the phone has not been added to the  
Cisco Unified Communications Manager Database, the phone registration request  
will be rejected. In this case, the phone will reset and attempt to register  
repeatedly.  
If the phone has registered before, the phone will access the configuration file  
named SEPmac_address.cnf.xml, where mac_address is the MAC address of the  
phone.  
The TFTP server generates these SIP configuration files:  
SIP IP Phone:  
For unsigned and unencrypted files—SEP<mac>.cnf.xml  
For signed files—SEP<mac>.cnf.xml.sgn  
For signed and encrypted files—SEP<mac>.cnf.xml.enc.sgn  
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Dial Plan—<dialplan>.xml  
Softkey Template—<softkey_template>.xml  
The filenames are derived from the MAC Address and Description fields in the  
Phone Configuration window of Cisco Unified Communications Manager  
Administration and the devicename field in the Cisco Unified Communications  
Manager database. The MAC address uniquely identifies the phone. For more  
information refer to the Cisco Unified Communications Manager Administration  
Guide.  
Understanding the Phone Startup Process  
When connecting to the VoIP network, the Cisco Unified  
IP Phone 7961G/7961G-GE and 7941G/7941G-GE go through a standard startup  
process that is described in Table 2-4. Depending on your specific network  
configuration, not all of these steps may occur on your Cisco Unified IP Phone.  
Table 2-4  
Cisco Unified IP Phone Startup Process  
Step  
Description  
Related Topics  
1. Obtaining Power  
If a phone is not using external power, the switch  
provides in-line power through the Ethernet cable  
attached to the phone.  
from the Switch  
Resolving Startup  
Problems,  
page 9-2.  
2. Loading the Stored  
The Cisco Unified IP Phone has non-volatile  
Resolving Startup  
Phone Image  
Flash memory in which it stores firmware images Problems, page 9-2.  
and user-defined preferences. At startup, the  
phone runs a bootstrap loader that loads a phone  
image stored in Flash memory. Using this image,  
the phone initializes its software and hardware.  
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Table 2-4  
Cisco Unified IP Phone Startup Process (continued)  
Step  
Description  
Related Topics  
3. Configuring VLAN  
If the Cisco Unified IP Phone is connected to a  
Cisco Catalyst switch, the switch next informs the  
phone of the voice VLAN defined on the switch.  
The phone needs to know its VLAN membership  
before it can proceed with the Dynamic Host  
Configuration Protocol (DHCP) request for an IP  
address.  
Network  
Configuration  
Menu, page 4-7.  
Resolving Startup  
Problems,  
page 9-2.  
4. Obtaining an IP  
If the Cisco Unified IP Phone is using DHCP to  
obtain an IP address, the phone queries the DHCP  
server to obtain one. If you are not using DHCP in  
your network, you must assign static IP addresses  
to each phone locally.  
Network  
Configuration  
Menu, page 4-7.  
Address  
Resolving Startup  
Problems,  
page 9-2.  
5. Accessing a TFTP  
In addition to assigning an IP address, the DHCP  
server directs the Cisco Unified IP Phone to a  
TFTP Server. If the phone has a statically-defined  
IP address, you must configure the TFTP server  
locally on the phone; the phone then contacts the  
TFTP server directly.  
Network  
Configuration  
Menu, page 4-7.  
Server  
Resolving Startup  
Problems,  
page 9-2.  
Note  
You can also assign an alternative TFTP  
server to use instead of the one assigned by  
DHCP.  
6. Requesting the CTL The TFTP server stores the certificate trust list  
Refer to the  
file  
(CTL) file. This file contains a list of  
Cisco Unified Communications Managers and  
TFTP servers that the phone is authorized to  
connect to. It also contains the certificates  
necessary for establishing a secure connection  
between the phone and  
Cisco Unified Communi  
cations Manager  
Security Guide,  
“Configuring the Cisco  
CTL Client” chapter.  
Cisco Unified Communications Manager.  
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Table 2-4  
Cisco Unified IP Phone Startup Process (continued)  
Step  
Description  
Related Topics  
7. Requesting the  
The TFTP server has configuration files, which  
define parameters for connecting to Cisco  
Unified Communications Manager and other  
information for the phone.  
Configuration File  
Resolving Startup  
Problems,  
page 9-2.  
8. Contacting Cisco  
Unified Communicatio Unified IP Phone communicates with Cisco  
The configuration file defines how the Cisco  
Resolving Startup  
Problems,  
ns Manager  
Unified Communications Manager and provides a  
phone with its load ID. After obtaining the file  
from the TFTP server, the phone attempts to make  
a connection to the highest priority Cisco  
Unified Communications Manager on the list. If  
security is implemented, the phone makes a TLS  
connection. Otherwise, it makes a non-secure TCP  
connection.  
page 9-2.  
If the phone was manually added to the database,  
Cisco Unified Communications Manager  
identifies the phone. If the phone was not  
manually added to the database and  
auto-registration is enabled in Cisco  
Unified Communications Manager, the phone  
attempts to auto-register itself in the Cisco  
Unified Communications Manager database.  
Note  
Auto-registration is disabled when  
security is enabled on Cisco Unified  
Communications Manager. In this case,  
the phone must be manually added to the  
Cisco Unified Communications Manager  
database.  
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network  
Adding Phones to the Cisco Unified Communications Manager Database  
Adding Phones to the Cisco Unified Communications  
Manager Database  
Before installing the Cisco Unified IP phone, you must choose a method for  
adding phones to the Cisco Unified Communications Manager database. These  
sections describe the methods:  
Table 2-5 provides an overview of these methods for adding phones to the  
Cisco Unified Communications Manager database.  
Table 2-5  
Methods for Adding Phones to the Cisco Unified  
Communications Manager Database  
Requires MAC  
Address?  
Method  
Notes  
Auto-registration No  
Results in automatic assignment  
of directory numbers.  
Not available when security or  
encryption is enabled.  
Auto-registration No  
with TAPS  
Requires auto-registration and the  
Bulk Administration Tool (BAT);  
updates information in the Cisco  
Unified IP Phone and in Cisco  
Unified Communications Manager  
Administration  
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Adding Phones to the Cisco Unified Communications Manager Database  
Table 2-5  
Methods for Adding Phones to the Cisco Unified  
Communications Manager Database (continued)  
Requires MAC  
Address?  
Method  
Notes  
Using the Cisco  
Unified  
Yes  
Requires phones to be added  
individually  
Communications  
Manager  
Administration  
Using BAT  
Yes  
Can add groups of same model of  
phone.  
Can schedule when phones are  
added to the  
Cisco Unified Communications  
Manager database.  
Adding Phones with Auto-Registration  
By enabling auto-registration before you begin installing phones, you can:  
Add phones without first gathering MAC addresses from the phones.  
Automatically add a Cisco Unified IP Phone to the Cisco Unified  
Communications Manager database when you physically connect the phone  
to your IP telephony network. During auto-registration, Cisco Unified  
Communications Manager assigns the next available sequential directory  
number to the phone.  
Quickly enter phones into the Cisco Unified Communications Manager  
database and modify any settings, such as the directory numbers, from  
Cisco Unified Communications Manager.  
Move auto-registered phones to new locations and assign them to different  
device pools without affecting their directory numbers.  
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Note  
Cisco recommends you use auto-registration to add less than 100 phones to your  
network. To add more than 100 phones to your network, use the Bulk  
Administration Tool (BAT). See the “Adding Phones with BAT” section on  
Auto-registration is disabled by default. In some cases, you might not want to use  
auto-registration: for example, if you want to assign a specific directory number  
to the phone or if you plan to implement authentication or encryption, as  
described in Cisco Unified Communications Manager Security Guide. For  
information about enabling auto-registration, refer to “Enabling  
Auto-Registration” in the Cisco Unified Communications Manager  
Administration Guide.  
Note  
When you configure the cluster for mixed mode through the Cisco CTL client,  
auto-registration is automatically disabled. When you configure the cluster for  
non-secure mode through the Cisco CTL client, auto-registration is automatically  
enabled.  
Related Topics  
Adding Phones with Auto-Registration and TAPS  
You can add phones with auto-registration and TAPS, the Tool for  
Auto-Registered Phones Support, without first gathering MAC addresses from  
phones.  
TAPS works with the Bulk Administration Tool (BAT) to update a batch of phones  
that were already added to the Cisco Unified Communications Manager database  
with dummy MAC addresses. Use TAPS to update MAC addresses and download  
pre-defined configurations for phones.  
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Note  
Cisco recommends you use auto-registration and TAPS to add less than 100  
phones to your network. To add more than 100 phones to your network, use the  
Bulk Administration Tool (BAT). See the “Adding Phones with BAT” section on  
To implement TAPS, you or the end-user dial a TAPS directory number and follow  
voice prompts. When the process is complete, the phone will have downloaded its  
directory number and other settings, and the phone will be updated in  
Cisco Unified Communications Manager Administration with the correct MAC  
address.  
Auto-registration must be enabled in Cisco Unified Communications Manager  
Administration (System > Cisco Communications Manager) for TAPS to  
function.  
Note  
When you configure the cluster for mixed mode through the Cisco CTL client,  
auto-registration is automatically disabled. When you configure the cluster for  
non-secure mode through the Cisco CTL client, auto-registration is automatically  
enabled.  
Refer to Cisco Unified Communications Manager Bulk Administration Guide for  
detailed instructions about BAT and about TAPS.  
Related Topics  
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Adding Phones to the Cisco Unified Communications Manager Database  
Adding Phones with Cisco Unified Communications Manager  
Administration  
You can add phones individually to the Cisco Unified Communications Manager  
database using Cisco Unified Communications Manager Administration. To do  
so, you first need to obtain the MAC address for each phone.  
For information about determining a MAC address, see the “Determining the  
After you have collected MAC addresses, in Cisco Unified Communications  
Manager Administration, choose Device > Phone and click Add New to begin.  
For complete instructions and conceptual information about Cisco Unified  
Communications Manager, refer to Cisco Unified Communications Manager  
Administration Guide and to Cisco Unified Communications Manager System  
Guide.  
Related Topics  
Adding Phones with BAT  
The Cisco Bulk Administration Tool (BAT) is a plug-in application for  
Cisco Unified Communications Manager that enables you to perform batch  
operations, including registration, on multiple phones.  
To add phones using BAT only (not in conjunction with TAPS), you first need to  
obtain the appropriate MAC address for each phone.  
For information about determining a MAC address, see the “Determining the  
Related Topics  
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Using Cisco Unified IP Phones with Different Protocols  
Using Cisco Unified IP Phones with Different  
Protocols  
The Cisco Unified IP Phone can operate with SCCP (Skinny Client Control  
Protocol) or SIP (Session Initiation Protocol). You can convert a phone that is  
using one protocol for use with the other protocol.  
This section includes these topics:  
Converting a New Phone from SCCP to SIP  
A new, unused phone is set for SCCP by default. To convert this phone to SIP,  
perform these steps:  
Procedure  
Step 1  
Take one of these actions:  
To auto-register the phone, set the Auto Registration Phone Protocol  
parameter in Cisco Unified Communications Manager Administration to SIP.  
To provision the phone using the Bulk Administration Tool (BAT), choose the  
appropriate phone model and choose SIP from the BAT.  
To provision the phone manually, make the appropriate changes for SIP on  
the Phone Configuration page in Cisco Unified Communications Manager  
Administration.  
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Using Cisco Unified IP Phones with Different Protocols  
Refer to Cisco Unified Communications Manager Administration Guide for  
detailed information about Cisco Unified Communications Manager  
configuration. Refer to Cisco Unified Communications Manager Bulk  
Administration Guide for detailed information about using the BAT.  
Step 2  
Step 3  
If you are not using DHCP in your network, configure the network parameters for  
the phone.  
See the “Configuring Startup Network Settings” section on page 3-14.  
Power cycle the phone.  
Converting an In-Use Phone from SCCP to SIP  
You can use the Bulk Administration Tool (BAT) to convert a phone that is in use  
in your network from SCCP to SIP. To access BAT from Cisco Unified  
Communications Manager Administration, choose Bulk Administration >  
Phones > Migrate Phones > SCCP to SIP. For detailed information, refer to  
Cisco Unified Communications Manager Bulk Administration Guide.  
Converting an In-Use Phone from SIP to SCCP  
To convert a phone that is in use in your network from SIP to SCCP, perform these  
steps. For more information, Cisco Unified Communications Manager  
Administration Guide.  
Procedure  
Step 1  
Step 2  
Step 3  
In Cisco Unified Communications Manager Administration, delete the existing  
SIP phone from the Cisco Unified Communications Manager database.  
In Cisco Unified Communications Manager Administration, create the phone as  
an SCCP phone.  
Power cycle the phone.  
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network  
Determining the MAC Address for a Cisco Unified IP Phone  
Deploying a Phone in an SCCP and SIP Environment  
To deploy Cisco Unified IP Phones in an environment that includes SCCP and SIP  
and in which the Cisco Unified Communications Manager Auto-Registration  
parameter is SCCP, perform these general steps:  
1. Set the Cisco Unified Communications Manager auto_registration_protocol  
parameter to SCCP.  
To do so, from Cisco Unified Communications Manager Administration,  
choose System > Enterprise Parameters.  
2. Install the phones.  
3. Change the auto_registration_protocol parameter to SIP.  
4. Auto-register the SIP phones.  
Determining the MAC Address for a Cisco Unified IP  
Phone  
Several procedures described in this manual require you to determine the MAC  
address of a Cisco Unified IP Phone. You can determine a phone’s MAC address  
in these ways:  
From the phone, press the Settings button and select Model Information and  
look at the MAC Address field.  
Look at the MAC label on the back of the phone.  
Display the web page for the phone and click the Device Information  
hyperlink.  
For information about accessing the web page, see the “Accessing the Web  
Page for a Phone” section on page 8-2.  
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